Mountain bikes have changed in the decade since the original Arch rim helped introduce the world to tubeless technology. With a 28mm wide asymmetrical rim shape and ultra-strong 6069 alloy, today's Arch MK4 rim has evolved to meet the demands of higher performance bikes. Throughout the years of testing and development, one thing has remained constant: versatility. Now more than ever, the Arch MK4 is the rim for you if you're looking for a reliable option that can handle any trail.

The Arch MK4 rim is light enough for cross-country racing, yet it is also the result of extensive research and testing on the Enduro World Series circuit. Made from a lightweight and strong 6069 aluminum alloy, it features a reinforced spoke bed and an internal width of 28mm, making it ideal for 2.2 to 2.5-inch tires, which allows for easier climbs and even better descents.

The BST Asymmetric shape of the Arch MK4 improves the spoke angle, resulting in a more stable overall wheel design. Unlike most asymmetric rims that are difficult to fill and do not seal evenly when cornering hard, the Arch MK4's shape is designed to distribute pressure evenly on both sides of the rim for easy inflation and exceptional tire retention.

Stan's patented Bead Socket Technology, combined with a stronger asymmetric design, lightweight and durable 6069 alloy, and the perfect rim width for balancing control and weight, make the Arch MK4 your best choice for all-around riding.

Specifications:

• Mouth width: 28 mm
• Tire type: Clincher
• Valve hole: French (SV)
• Width: 31.4 mm
• Compatible tire size: 29 inches
• Suitable for disc brakes
• Diameter valve hole: 6.5 mm

Features:

• Tubeless Ready

Main information:

• Range of use: MTB
• Type of construction: Drop center rim
• Type of material: Aluminum

Details:

• Height: 18.9 mm
• Maximum spoke tension: 1275N
• For rim strip: 30 mm
• ISO: 29" x 31.4 mm
• ETRTO: 622 x 28.0 (29")
• ERD: 600 mm, 2.5 mm offset (29").